bzr: ERROR: exceptions.KeyError: '2523be4aaa4104ec6ce975f3324e922b710ecc18'

Traceback (most recent call last):
  File "/usr/lib64/python2.7/site-packages/bzrlib/commands.py", line 920, in exception_to_return_code
    return the_callable(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/bzrlib/commands.py", line 1131, in run_bzr
    ret = run(*run_argv)
  File "/usr/lib64/python2.7/site-packages/bzrlib/commands.py", line 673, in run_argv_aliases
    return self.run(**all_cmd_args)
  File "/usr/lib64/python2.7/site-packages/bzrlib/commands.py", line 695, in run
    return self._operation.run_simple(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/bzrlib/cleanup.py", line 136, in run_simple
    self.cleanups, self.func, *args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/bzrlib/cleanup.py", line 166, in _do_with_cleanups
    result = func(*args, **kwargs)
  File "/usr/lib64/python2.7/site-packages/bzrlib/plugins/git/commands.py", line 118, in run
    refs = interrepo.fetch()
  File "/usr/lib64/python2.7/site-packages/bzrlib/plugins/git/fetch.py", line 657, in fetch
    mapping)
  File "/usr/lib64/python2.7/site-packages/bzrlib/plugins/git/fetch.py", line 746, in fetch_objects
    wants = determine_wants(remote_refs)
  File "/usr/lib64/python2.7/site-packages/bzrlib/plugins/git/fetch.py", line 598, in determine_wants_all
    potential.add(self.source.bzrdir.get_peeled(k))
  File "/usr/lib64/python2.7/site-packages/bzrlib/plugins/git/dir.py", line 546, in get_peeled
    return self._git.get_peeled(ref)
  File "/usr/lib64/python2.7/site-packages/dulwich/repo.py", line 398, in get_peeled
    return self.object_store.peel_sha(self.refs[ref]).id
  File "/usr/lib64/python2.7/site-packages/dulwich/object_store.py", line 213, in peel_sha
    obj = self[sha]
  File "/usr/lib64/python2.7/site-packages/dulwich/object_store.py", line 115, in __getitem__
    type_num, uncomp = self.get_raw(sha)
  File "/usr/lib64/python2.7/site-packages/dulwich/object_store.py", line 377, in get_raw
    raise KeyError(hexsha)
KeyError: '2523be4aaa4104ec6ce975f3324e922b710ecc18'

bzr 2.5.1 on python 2.7.10 (Linux-4.7.4-gentoo-
    x86_64-Intel-R-_Celeron-R-_CPU_G1820_@_2.70GHz-with-gentoo-2.2)
arguments: ['/usr/lib/python-exec/python2.7/bzr', 'git-import',
    '/home/dgd/git/skotos']
plugins: bash_completion[2.5.1], changelog_merge[2.5.1], git[0.6.8],
    gtk[0.103.0], launchpad[2.5.1], netrc_credential_store[2.5.1],
    news_merge[2.5.1], po_merge[2.5.1], rewrite[0.6.3], weave_fmt[2.5.1]
encoding: 'ascii', fsenc: 'utf8', lang: 'C'

*** Bazaar has encountered an internal error.  This probably indicates a
    bug in Bazaar.  You can help us fix it by filing a bug report at
        https://bugs.launchpad.net/bzr/+filebug
    including this traceback and a description of the problem.